DE3003247A1 - Two cylinder concrete pump - has contact faces of port plate of parallel cylinders and ring of swivel outlet with titanium carbide in steel deposit - Google Patents

Abstract

The pump for moving concrete or similar substances comprises two parallel pump cylinders (1) with pistons (3), a feed container (4) directly connectable to either cylinder, and an outlet line (9'). A distributor (8) is moved (via 8') to connect the line (9') to one cylinder outlet via a movable coupling ring (11) whilst the inlet to the other cylinder is connected to the container and vice versa. The corresponding contact surfaces of the ring and the cylinder port face are provided with a machinable and hardenable deposit in a sintered material consisting of approximately 50 vol % Ti-carbide in a steel matrix and having a hardness of HRC 70 after hardening.

Description

"Training a pump to deliver

pulpy masses, especially concrete, etc. " The invention relates to the training of a pump for pumping pasty masses, in particular Beon etc., consisting of at least two parallel to each other in cylinders arranged delivery piston, from a feed container that can be directly connected to each cylinder and a pressure line, each of which is the outlet through a controlled distributor of the conveying cylinder with the pressure line through a movable intermediate element is connected, while the entry into the respective suction cylinder to the feed container is open.

Such a pump is identified, for example, by German patent 2 104 191.

With this pump, the feed hopper stands with two openings The cylinder cylinder pump in connection, the main component of the distributor being an S-shaped Distribution pipe as a movable intermediate element for connection between the feed container arranged, the cylinders connected openings and the pressure line is.

The S-shaped distributor pipe can be pivoted via a coupling and axially displaceable, i.e. adjustable in this direction, the pressure line tied together.

In the context of the further development of this pump it is provided that the openings in the bottom of the hopper facing the cylinders with a replaceable wear part are equipped. The only one-step, i.e. cylinder side, Use of wearing parts suggested in the feed hopper, but cannot to satisfy, since the wear then-predominantly the movable one Intermediate element, in this case the pivotable distributor pipe, is conveyed, so that despite the possibility of adjustment with the necessity of a premature Exchange of these parts must be expected.

Furthermore, in this situation, the harder ones will wear out Wear rings are not avoided, so that their, although usually only required later Replacement, including additional downtime.

It is therefore the object of this invention to reduce the wear and tear of both against each other guided parts, namely that of the intermediate element, i.e. that of the pivotable Distribution pipe and the wear rings arranged in the feed container around the The openings leading to the cylinders become very uniform, and at the same time reduce wear to a minimum leading to zero, roughly the performance-related life expectancy of the overall pump, with the following objective in summary is addressed, the worn-out costs, the labor costs and the downtimes to be largely eliminated and better operational readiness through appropriate Ensure training of a pump according to the type mentioned at the beginning.

The inventive solution to this problem provides that at least the connecting areas between the respective opening of the delivery cylinder in the feed container and the corresponding surface of the intermediate element Consists of machinable and hardenable sintered llartstuff wear parts are equipped, and that the hard material used from about 50 vol. * Titanium carbides, which are embedded in a steel matrix, exists and according to his Hardening has an HRC value of approx. 70.

This training is not only the wear between the different pump parts but rather the proposed solution takes into account the fact that the harshest components of the environment, i.e. the pulpy concrete, certain abrasion only through the use of an opposite the hardness of the concrete component has a higher hardness value showing hard materials can be.

The proposed hard material is easy to machine and not very sensitive to grinding and harden with almost no distortion.

For this reason, it is sufficient to remove marginal zones after hardening usually dimensions of 0.04 mni per side.

For the special training of a pump according to these principles is proposed that the intermediate element is a pivotable and axially displaceable The distribution pipe is the radial in its openings towards the cylinders Level ends in a retaining ring provided with a collar, and that in the retaining ring the wear ring is fixed by soldering, adhesive or screw connections.

These are shown in their basic features by the aforementioned patent specification Concept has proven itself very well.

For further training it is proposed that the cylinder opening openings directed towards the distributor pipe through a wear plate lead, which is dimensioned so that through the surface of the entire through the wear ring diameter, the swivel radius and the swivel angle of the distributor pipe certain pivot surface can be covered.

This design eliminates the caking that is usual with wear rings and prevents encrustations between the rings and thus the sources of attack avoided for additional wear.

For manufacturing reasons, it can be useful if the Wear plate made of two mirror-inverted, flat butting Sharing consists.

To reduce the swivel area, it is proposed that the for Swivel center of the distributor pipe directed edge surface of the wear ring is flattened to the extent that the correspondingly opened bun (3 of the retaining ring the wear ring is still about two-thirds of its circumference.

The proposed training will fully meet the requirements of dr Appropriate to the task.

The invention is illustrated in an exemplary manner by the accompanying drawing Execution explained in more detail.

Figure 1 shows a section through the pump in elevation, according to section II-II through Figure 2.

Figure 2 shows a section through the pump in plan, according to section I-I through Figure 1.

FIG. 3 shows a detailed representation of part of the wear plate in plan in connection with the distributor pipe and the wear ring in section IV-IV Figure 4.

FIG. 4 shows in elevation a detailed representation of a section through the swivel tube and the wear ring with the one in the direction of the swivel shaft partially open retaining ring and through the wear plate according to section III-III Figure 3.

the two cylinders 1 and 2 of the pump open out via bends 1 'and 2 'into the control base 5 of the feed container 4 through the openings 6 and 7, respectively.

In cylinders 1 and 2 there is a piston 3 each, namely in opposite directions to the second piston, driven.

I) IS with its pivot shaft 8 in the control base 5 gelugerte, approximately S-shaped trained, distributor pipe 8 is driven by a distributor drive, not shown, including control, pivoted about its shaft 8 'in such a way that that the connection between a cylinder 1 or 2 and the pressure line 9 'via a Opening 6 or 7 is established and maintained until this cylinder, due to the piston pressure, has emptied and the cylinder has meanwhile been filled Impulse for the piston advance with simultaneous changeover of the distributor pipe 8 to the other opening 6 or 7 received by the control for the distributor.

The distributor pipe 8 opens up into the pressure line 9 'via the Manifold 8 and pressure line 9 'connecting coupling 9 and is down through one arranged in a retaining ring with collar 10 wear ring 11 - from the Hard material described is made - limited.

»He to the pivot shaft 8 'directed area of the edge surface 11' des Veschleißringes 11 is about a third of its circumference by one opposite the radius of the wear ring enlarged and from the center iii of the di.c Swivel shaft in the direction of the set-back radius flattened.

Corresponding to this flattened edge 11 'is a in the collar 10 Waistband cutout 10 'formed. The with the control base 5 by screw connections 13 connected wear plate 12 is formed by two mirror-inverted wear plate parts 12 'and 12 "formed.

The wear plate is made of the same material as the wear ring manufactured.

The pivot surface 14 on the wear plate 12 is defined by the pivot radius 15 and the pivot angle 16 of the distributor pipe in connection with its diameter or in connection with the diameter of the wear ring 11 and is determined shown in dashed lines in FIG.

Claims (5)

Claims training of a pump for pumping pulpy Masses, especially concrete, etc., consisting of at least two in cylinders eJefühl £> delivery pistons arranged parallel to one another, from one with each cylinder directly connectable feed container and a pressure line, with a controlled one Distributor in each case the output of the conveying cylinder with the pressure line through a movable intermediate element is connected while entering each suction cylinder is open to the feed container, characterized in that d a ß at least the connecting areas between the respective opening (6 or 7) of the feed cylinder (1 or 2) in the feed container and the corresponding Surface of the intermediate element made of machinable and hardenable sintered hard material existing wear parts (11 and 12) are equipped, and that the used Hard material made of about 50 vol% titanium carbides, which are embedded in a steel matrix, exists and has an HRC value of approx. 70 after it has hardened. 2. Formation of a pump according to claim 1, characterized in that The intermediate element is a pivotable and axially displaceable distributor pipe (8) is the one in its openings (6 or 7) directed towards the cylinders (1 or 2) radial plane ends in a retaining ring (10) provided with a collar and d a ß in the retaining ring (10) the wear ring (11) by soldering, adhesive or screw connections is fixed. 3. Formation of a pump according to claim 1, characterized in that d a ß those opening into the cylinder (1/2) and directed against the distributor pipe (8) Guide openings (6/7) through a wear plate (12) which is dimensioned so that that through the surface of the entire, through the wear ring diameter, the Pivot radius (15) and the pivot angle (16) of the distributor pipe (8) determined Swivel surface (14) can be covered. 4. Formation of a pump according to claim 3, characterized in that d a ß the wear plate (12) made of two mirror-inverted, flat butting Parts (12 'and 12 "). 5. Formation of a pump according to claims 2 and 3, characterized in that d a ß the edge surface (11 ') directed towards the pivot center of the distributor pipe (7) of the wear ring (11) is flattened to the extent that the correspondingly opened The collar of the retaining ring (10) of the wear ring (11) is still about two thirds of its length Scope is included.